Respiratory exchange ratio sensor

Details Respiratory exchange ratio sensor Respiratory exchange ratio sensor

A - Human Necessities

61

B

A61B 5/083 (2006.01) A63B 22/00 (2006.01)

Patent

CA 2540772

A device for directly measuring a person's respiratory exchange ratio (RER) utilizes a Zn-air battery cell and a constant current load circuit as an O2 pump capable of drawing oxygen from expired air. A thermistor located in the flow path forms a leg of a bridge circuit whose output is proportional to oxygen concentration in the expired air and, therefore, to oxygen uptake. The thermistor flowmeter circuit utilizes the thermal conductivity differences between O2 and CO2 to provide a measure at the relative ratio of the two gases present.

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